Club Trial & Track Trial Car Classification rules can be found in the Supplementary Regulations, pages 4 & 5. A link is also included in the Supps for instruction on calculating your vehicle's performance potential index and establishing your production cars Club Trial or Track Trial class.

Tech Inspection Guidelines - Bring completed self tech forms or Annual Tech/Vehicle Logbook to Tech Inspection after registering. All cars must have a Tech Sticker in place before to go on track. First Page is for Production Based Vehicles, Both Pages For Non-Production, Tube Frame Race or Track Prepped Vehicles.

Sound Levels: 103dbA sound limit is in effect at all Thunderhill events between the hours of 9:00 a.m. and 5 p.m. Sound levels before 9:00 am and after 5:00 pm must not exceed 95 dbA. No race engines at Thunderhill may be started before 7:30 a.m. nor operate after 6:00 p.m.

Notice:Timing is not allowed in SCCA PDX events. Transponders are required for all Club or Track Trials competitors wishing to have timed results or to compete for region championship points. Transponders are available on a first come, first served basis for a rental fee of $25.

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